<?php

/**
 * "Unified" diff renderer.
 *
 * This class renders the diff in classic "unified diff" format.
 *
 * $Horde: framework/Text_Diff/Diff/Renderer/unified.php,v 1.5 2006/01/08 00:06:57 jan Exp $
 *
 * @package Text_Diff
 */
class Text_Diff_Renderer_unified extends Text_Diff_Renderer {

		/**
 		* Number of leading context "lines" to preserve.
 		*/
		var $_leading_context_lines = 4;

		/**
 		* Number of trailing context "lines" to preserve.
 		*/
		var $_trailing_context_lines = 4;

		function _blockHeader($xbeg, $xlen, $ybeg, $ylen)
		{
				if ($xlen != 1) {
						$xbeg .= ',' . $xlen;
				}
				if ($ylen != 1) {
						$ybeg .= ',' . $ylen;
				}
				return "@@ -$xbeg +$ybeg @@";
		}

		function _added($lines)
		{
				return $this->_lines($lines, '+');
		}

		function _deleted($lines)
		{
				return $this->_lines($lines, '-');
		}

		function _changed($orig, $final)
		{
				return $this->_deleted($orig) . $this->_added($final);
		}

}
